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After faulty applying 12V on the QRP-LABS U3S smoke came from the BS170
Display back-light ceased out U3S was dead did not boot the ATMEGA328 was blown.
Placed the working U3S in its case
Applied power on it but forgot to check the Voltage major mistake.

The ATMEGA and the BS170 where smoked but no other damage
The Si5351a Synthesizer board has its own 3V3V regulator that protected it
The QLG1 GPS rx was not yet connected besides its chip has it own 3V3

So i had to program a new ATMGA328 with U3S V312.hex

The ATMEGA328 was programmed with an other device verified okay
But it would not boot. I had to use my own ISP Ponyprog and SI-IO interface

Ponyprog V2.08d beta has the ATMEGA328 in the device list Earlier version not. With SI-IO to the U3 SPI socket it first failed to see the 328. 2 things where wrong: 1.The U3 Reset needs R3 100k (91k) not the jumper to +5 2. Had to remove C1 on CLK.
Then it could read and write t…